How should I check if my phone still working

Hello, yesterday I dropped my phone and I think that my display is dead now, because the screen is not working at all, just making a little white line at upper left corner. The phone is still intact and everything is alright even the front glass. I also accidentally called to an emergency with power button and phone's speakers and microphone is still working. Can I somehow check more if it still working, because display change is cheaper for me now than buying a new phone